Many Food blogs and magazines have reported the benefits of olive oil.

Now this one is more serious, or credible - straight from The New England Journal of Medicine :

"In conclusion, in this primary prevention trial, we observed that an energy-unrestricted Mediterranean diet, supplemented with extra-virgin olive oil or nuts, resulted in a substantial reduction in the risk of major cardiovascular events among high-risk persons. The results support the benefits of the Mediterranean diet for the primary prevention of cardiovascular disease."

Translate: "energy-unrestricted" --> "eat as much as you want""substantial reduction in the risk of major cardiovascular events among high-risk persons" --> "less heart attack if you're at risk".

Well maybe do not eat as much as you want, but basically, olive oil and nuts are good for you.